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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jake O'Brien | 1-1 | 25 | 27 | .481 | 4.47 | 178 | 48 | 1 | 0 | 6 | 435.1 | 459 | 216 | 45 | 151 | 275 |
| Matt O'Connor | 23-1 | 80 | 72 | .526 | 3.25 | 241 | 221 | 11 | 4 | 11 | 1383.0 | 1292 | 500 | 91 | 290 | 864 |
| Lee O'Hanian | 14-1 | 51 | 57 | .472 | 3.00 | 696 | 1 | 0 | 0 | 295 | 756.1 | 641 | 252 | 47 | 178 | 682 |
| Jason O'Keeffe | 0-2 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.0 | 3 | 4 | 0 | 1 | 0 |
| Joe O'Leary | 0-0 | 15 | 8 | .652 | 4.46 | 168 | 0 | 0 | 0 | 5 | 205.2 | 195 | 102 | 25 | 105 | 164 |
| Bill O'Neil | 0-0 | 0 | 0 | .000 | 22.50 | 1 | 0 | 0 | 0 | 0 | 2.0 | 4 | 5 | 0 | 2 | 2 |
| Ross O'Rourke | 0-1 | 4 | 8 | .333 | 4.56 | 50 | 3 | 0 | 0 | 0 | 92.2 | 94 | 47 | 15 | 36 | 72 |
| Nick Oakes | 0-0 | 13 | 18 | .419 | 3.81 | 266 | 0 | 0 | 0 | 41 | 309.1 | 308 | 131 | 33 | 151 | 232 |
| Billy Ochoa | 1-1 | 18 | 20 | .474 | 4.46 | 105 | 39 | 0 | 0 | 7 | 270.1 | 277 | 134 | 34 | 117 | 281 |
| Tae-geun Ock | -1-1 | 0 | 0 | .000 | 27.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 3 | 3 | 1 | 3 | 0 |
| Jesse Odom | 0-0 | 1 | 2 | .333 | 5.95 | 18 | 2 | 0 | 0 | 1 | 39.1 | 58 | 26 | 5 | 19 | 33 |
| Jamie Offield | -1-2 | 3 | 7 | .300 | 7.71 | 26 | 14 | 0 | 0 | 0 | 77.0 | 103 | 66 | 13 | 44 | 64 |
| Miguel Olea | 1-1 | 13 | 7 | .650 | 3.61 | 36 | 36 | 1 | 1 | 0 | 212.0 | 206 | 85 | 24 | 81 | 187 |
| Andy Oleksy | 0-0 | 3 | 2 | .600 | 7.11 | 39 | 0 | 0 | 0 | 3 | 62.0 | 71 | 49 | 13 | 26 | 50 |
| Tim Oley | 5-6 | 25 | 41 | .379 | 4.29 | 201 | 57 | 3 | 2 | 8 | 568.0 | 570 | 271 | 55 | 213 | 329 |
| Joel Oliver | 0-2 | 4 | 1 | .800 | 3.83 | 69 | 0 | 0 | 0 | 4 | 124.2 | 98 | 53 | 11 | 59 | 113 |
| Noah Oliver | 0-1 | 16 | 23 | .410 | 4.06 | 86 | 52 | 2 | 1 | 0 | 352.1 | 307 | 159 | 45 | 161 | 449 |
| Cory Olson | 0-2 | 1 | 3 | .250 | 4.24 | 56 | 0 | 0 | 0 | 4 | 76.1 | 82 | 36 | 8 | 26 | 46 |
| Mike Olson | 0-2 | 2 | 2 | .500 | 4.24 | 67 | 0 | 0 | 0 | 5 | 87.0 | 97 | 41 | 18 | 22 | 77 |
| Ryan Orsak | 1-0 | 9 | 16 | .360 | 5.20 | 59 | 33 | 0 | 0 | 0 | 197.1 | 223 | 114 | 23 | 95 | 126 |
| Antonio Ortega | 0-1 | 5 | 3 | .625 | 3.77 | 76 | 0 | 0 | 0 | 4 | 74.0 | 55 | 31 | 7 | 26 | 90 |
| Erik Ortega | 0-6 | 0 | 0 | .000 | 3.63 | 7 | 0 | 0 | 0 | 0 | 17.1 | 15 | 7 | 1 | 7 | 11 |
| Joel Osborne | 7-0 | 51 | 56 | .477 | 4.49 | 251 | 131 | 10 | 1 | 11 | 1053.2 | 1031 | 526 | 128 | 414 | 748 |
| Chomei Osumi | 2-1 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 1 | 0 |
| Joe Owens | 1-0 | 10 | 6 | .625 | 4.78 | 63 | 11 | 0 | 0 | 0 | 156.1 | 156 | 83 | 19 | 60 | 117 |
| Steve Owens | 5-0 | 26 | 45 | .366 | 4.51 | 213 | 82 | 0 | 0 | 3 | 636.1 | 673 | 319 | 59 | 246 | 373 |
